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EQ · API

API TranZformer CMP

The API TranZformer CMP is a VCA compressor pedal based on API's 527 circuit, featuring a transformer output and professional-grade components including API's 2510 op-amp.

  • 9-18V DC · center −
  • 100 mA
  • Mono
New
from $282.54
Used (asking)
from $249

The rundown

Highlights

  • VCA compressor with transformer output stage
  • Based on API 527 circuit design
  • Adjustable Attack and Release switches plus Sustain control
  • Operates on 9-18V DC power with buffered bypass
  • Compact pedal format at 122.4 x 95 mm

Best for

Guitarists and bassists seeking a studio-quality compressor in pedal form.

Quick facts

Power
9-18V DC
Current draw
100 mA
Polarity
Center negative
Dimensions
122.4 × 95 mm
Controls
Input, Sustain, Output, Blend, Attack Switch, Release Switch, Type Switch
Stereo
No
MIDI
No
Status
In production

Where to buy API TranZformer CMP

$282.54 lowest new price · Reverb

Used listings asking $249–$249, median $249 (1 listing, small sample). Asking prices, not sold prices.

Current offers
SellerConditionPriceLink
ReverbUsed$249View
ReverbNew$282.54View
ReverbNew$295View

Prices last checked 20 hours ago. Links to sellers are affiliate links.

Frequently asked questions

What power supply does the API TranZformer CMP use?

The API TranZformer CMP runs on 9-18V DC power with 100 mA current draw and center-negative polarity.

Does the API TranZformer CMP have true bypass?

The API TranZformer CMP features buffered bypass.

What controls are on the API TranZformer CMP?

The API TranZformer CMP has Input, Sustain, Output, and Blend knobs, plus Attack, Release, and Type switches.

Similar pedals

Same type, similar features.

Specs from pedalfilter. Summary written by PedalBro from those specs and public descriptions.

Page last updated September 29, 2026.